Theophylact of Ohrid — on Phlm 1:10 (Commentary on Philemon)

“He has not yet mentioned the name of the one on whose behalf he is interceding. He first softens Philemon with praise of the servant, calling him his son. Why does he call him so? Because, he says, I begot him, that is, I instructed him with the Gospel and commanded that the one who believed be baptized, and this in difficult circumstances: in chains. Having thus softened his heart, he finally mentions the name.”